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To fix the secondary air injection system on a Cadillac DTS, first, diagnose the issue using an OBD-II scanner to check for fault codes related to the system. Common problems include a faulty air pump, blocked hoses, or a malfunctioning check valve. Inspect and clean or replace any damaged components, ensuring that the air pump is functioning properly and that all hoses are clear of obstructions. Once repairs are made, clear the fault codes and test the system for proper operation.

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